Only a few months ago, Mr Johnson was also scathing about Mr Trump – saying he wouldn’t go to New York City for fear of bumping into him.

Ms Mogherini also lashed out at Boris for snubbing other European foreign ministers by staying away from a ‘crisis’ dinner on Sunday night to discuss Donald Trump’s election, along with France and Hungary.

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He said: “Instead of an expensive new headquarters which is unnecessary and simply duplicates NATO, instead of dreaming of an European army, the easiest and simplest reaction to the Trump Presidency is for other European countries, some of them quite wealthy, to step up their own defence spending and to meet the 2% commitment. Britain does that already.”

Former NATO boss Anders Fogh Rasmussen backed Sir Michael’s call, and also asked for an urgent summit to force Donald Trump to reaffirm the US’s support for the rocking alliance.